If spacecraft x has twice the mass of spacecraft y , then true statements about x and y include which of the following? i) on earth, x experiences twice the gravitational force that y experiences. ii) on the moon, x has twice the weight of y . iii) when both are in the same circular orbit, x has twice the centripetal acceleration of y .

Why do electron microscopes have higher resolving power than light microscopes?

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

From 0 to 5 seconds john pushed a box 5 meters. from 5 to 10 seconds, paul pushed the same box another 5 meters. who did more work? a. john b. paul c. john and paul did the same amount of work.